From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 515ECC7EE30 for ; Tue, 1 Jul 2025 13:15:21 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uWaoa-0007TP-AU; Tue, 01 Jul 2025 09:14:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uWaoT-0007Ox-GP for qemu-devel@nongnu.org; Tue, 01 Jul 2025 09:14:18 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uWaoL-0005bi-Co for qemu-devel@nongnu.org; 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Tue, 1 Jul 2025 13:13:58 +0000 (UTC) Received: from redhat.com (unknown [10.44.34.118]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A5B28180035E; Tue, 1 Jul 2025 13:13:52 +0000 (UTC) Date: Tue, 1 Jul 2025 15:13:49 +0200 From: Kevin Wolf To: Fiona Ebner Cc: qemu-block@nongnu.org, qemu-devel@nongnu.org, den@virtuozzo.com, andrey.drobyshev@virtuozzo.com, hreitz@redhat.com, stefanha@redhat.com, eblake@redhat.com, jsnow@redhat.com, vsementsov@yandex-team.ru, xiechanglong.d@gmail.com, wencongyang2@huawei.com, berto@igalia.com, fam@euphon.net, ari@tuxera.com Subject: Re: [PATCH v4 27/48] block: call bdrv_set_backing_hd() while unlocked in bdrv_open_backing_file() Message-ID: References: <20250530151125.955508-1-f.ebner@proxmox.com> <20250530151125.955508-28-f.ebner@proxmox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250530151125.955508-28-f.ebner@proxmox.com> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_PASS=-0.001, T_SPF_HELO_TEMPERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Am 30.05.2025 um 17:11 hat Fiona Ebner geschrieben: > This is in preparation to mark bdrv_set_backing_hd() as > GRAPH_UNLOCKED. > > Signed-off-by: Fiona Ebner > --- > block.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/block.c b/block.c > index 1da10d55f0..ca3b67b233 100644 > --- a/block.c > +++ b/block.c > @@ -3632,7 +3632,8 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, > Error *local_err = NULL; > > GLOBAL_STATE_CODE(); > - GRAPH_RDLOCK_GUARD_MAINLOOP(); > + > + bdrv_graph_rdlock_main_loop(); > > if (bs->backing != NULL) { > goto free_exit; > @@ -3711,9 +3712,12 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, > backing_hd->filename); > } > > + Extra blank line. > /* Hook up the backing file link; drop our reference, bs owns the > * backing_hd reference now */ > + bdrv_graph_rdunlock_main_loop(); > ret = bdrv_set_backing_hd(bs, backing_hd, errp); > + bdrv_graph_rdlock_main_loop(); > bdrv_unref(backing_hd); > > if (ret < 0) { Kevin